Abstract
S 1 → S 0 internal conversion ( k IC) and S 1 → T 1 ( k ISC) intersystem crossing rate constants were determined and compared in the group of mono- and di-aza derivatives of 1,2-benzanthracene. Quantum yields of triplet formation (Φ ISC) were obtained from pulsed photoacoustic measurements. The extremely fast k ISC = 4 × 10 10 s −1 was found for 1,2-benzphenazine in aprotic solvents. k IC of free bases and monoprotonated species are two orders of magnitude greater than that of the parent hydrocarbon.
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